Casting ejector for pressure casting molds



May7, 1957 Filed July 28, 1955 ASIHIG EJECTQR' FOR PRE SURE CA TIN MOLD Leon Saives, Billancour't, France, assignor to Regie Nationale des Usines Renault, Billancourt, France, and Societe des HautseEourneaux et :Forges dAllevard, vBar szrauccta corporation ,ofthe French R pu The invention relates to pressure die-casting machines and morepartipularly tomachines, for casting ferrous. metals and is concerned with improvements in these machines, the object-of such improvements being devices for ejecting the metal residue from the end-of the-ladle cylin- .der and for extracting the core, the casting andthe chill mo d,

vIn a machine for die-casting under pressure, each oper ation leaves a metal residue betweenthe head =of the ladle piston and the end of the ladlecylinder, and it isdiflicult to detach this residue after opening the apparatus. It is. alsonecessary to carry outthe following operav .t pn

Timed-extraction of different cqtesserving as cooling devices,

Ejection of the casting after opening the mould.

The invention has for its object an ejector device designed to facilitate the removal of the metal residue from the end of the ladle cylinder and a particular arrangement of the machine in which the different successive movements indicated above are obtained by setting in operation a single hydraulic cylinder. All the necessary movements are controlled by a timing device.

In the accompanying drawing:

Figure 1 is a diagrammatic view showing a section of an ejector 'device for the metal residue in a pressure casting machine.

Figure 2 is a plan view of a detail of the above device.

Figure 3 shows by way of example in elevation and diagrammatic section the arrangement for extracting the core, the casting and the chill mould in a pressure diecasting machine.

Figure 4 is a top plan view of the collar or flange forming part of the arrangement shown in Figure 3.

By referring to Figures 1 and 2 it will be seen that when the plate 1 connected with the upper part of the mould 2 is lifted by means of jacks (not shown), it lifts the top part 5 of the ladle cylinder by means of rods 17. The

top 5 of the ladle cylinder is made fast with the bottom 3 of the mould. The bottom 7 of the ladle cylinder is fast with the press plate 18. 12 is the ladle piston and 8 is the injection piston. A forked rod 13 hinged at 9 on the plate 18 is arranged to cause 'a vertical displacement of the ejector rod 11 which is hinged about a pin on the rod 13. The end of the rod 13 remote from the fork is arranged to be raised by means of the looped end 14 of a rod 15 Which is pivoted at 16 on the member 5.

The stripping operation of the apparatus is as follows:

During the stripping the plate 1 is lifted and opens the mould 2, 3, and, after the rings attached to the plate I reach the ends of the rods 17 the plate 5 is lifted. This lifting movement acts on the rod 15 by way of the loop 14, and lifts the end of the rod 13. The member 7 and the plate 18 remain fixed and the fork 13 rocks in a counter-clockwise direction about the pin 9, as viewed in the figure, and the ejector rod 11 penetrates the bottom 7 of the ladle cylinder, driving out the metal residue.

States patefltto 2,791,0 14 "Patented May ,1957

ICC

:Itis quite obvious that thepresent invention maybe applicable to ny other arrang men of the axes of .the

ladleand injection cylinders .andof the joint planes.

,Eigure 3 shows .diagra nmatically. a deviceiforextracting th core, and removing th casting from a chillmould forming part of a pressure die-casting machinehaving a horizontal joint plane in which the injection cylinder is vertical, the injectiontaking place at the bottom of the cy i der.

.The cast-ing22 in the two chill moulds 20 -and"21 has a core 23whichacts also asacooling device and'has to be removed at a certain time after the mould is titled. This core 23 is fixed by aquick locking device '(not shown) to a piston 28 sliding .in a double-acting cylinder 27 containingoil or water. The piston 28 is fast with, the rod 30. Ejection'plungers '24 sliding in thechill mould .21 are seeuredto a notched collar 25. Two latenal studs 26 are secured on opposite sides of an upperextensionof in position,gknown timing mechanisms cause the casting operations to be carried out. At acertain instant, one

"timing mechanism causes oil or water to be introduced into the upper part of the cylinder 27 and another timing mechanism turns the piston 28 in such a manner that the studs 26 pass through the notches 31 of the collar 25. The downward movement of the piston 28 causes the extraction of the cooling core 23. When the solidification of the casting has been completed, the timing de vices cause the raising of the upper part 20 of the chill mould and act on the jack 32 in such manner as to bring the studs 26 into registry with the solid portions of the collar and open the 'oil or water inlets into the bottom of the cylinder 27. The piston 28 moves upwardly, the studs 26 come into contact with the collar 25, and cause the raising of the ejector plungers 24 which force the casting out of the lower portion of its mould 21.

The present improvement is applicable to the successive lifting of any number of ejector pistons by a single jack. It is sufficient to associated a suitably shaped collar 25 with each piston or group 'of ejector pistons. The rotational control of a piston such as 28 permits of selecting the collar to be operated.

I claim: 1

1. In a pressure casting machine having a mold bottom and an upper mold adapted to be raised therefrom, a ladle cylinder having a top portion rigidly connected to the mold bottom and adapted to be raised and an immovable lower portion supported upon the base of the machine, a device for ejecting the residue from the end of the ladle cylinder comprising a forked rod having forked arms at one end pivotally connected to themachine base, a lost-motion connecting means positively engaging the other end of said arm and being connected to the upper portion of the ladle cylinder and adapted to raise said arm upon upward movement of said upper portion of said ladle cylinder beyond a predetermined distance, an ejector rod pivotally mounted on said arm between the ends of said arm and extending through said lower portion of the ladle cylinder and adapted to enter said cylinder to eject the residue upon upward movement of said arm and to be retracted upon downward movement of said arm, said lost-motion connecting means effecting positive entry and retraction of said ejector rod in response to movements of said upper portion of the ladle cylinder.

2. A pressure casting machine having a mold bottom and an upper mold adapted to be raised therefrom, sald upper mold being rigidly connected to a lifting plate, a

ladle cylinder having a top portion rigidly connected to the mold bottom and adapted to be raised and an immovable lower portion supported upon the base of the machine, a lost-motion connecting vdevice'between said top portion and said lifting plate, and a device for ejecting the residue from the end of the ladle cylinder, said device comprising a forked rod having forked arms at one end pivotally connected to the machine base, a lost motion connecting means positively engaging the other end of said arm and being connected to the upper portion of the ladle cylinder and adapted to raise said arm upon upward movement of said upper portion of said ladle cylinder beyond a predetermined distance, an ejector rod pivotally mounted on said arm between the ends of said arm and extending through said lower portion of the ladle cylinder and adapted to enter said cylinder to eject the residue upon upward movement of said arm and to be retracted upon downward movement of said arm, said lost-motion connecting means effecting positive entry and retraction of said ejector rod in response to movements of said upper portion of the ladle cylinder.

3. A pressure casting machine having a mold bottom and an upper mold adapted to be raised therefrom, said upper mold being rigidly connected to a lifting plate, a ladle cylinder having a top portion rigidly connected to the mold bottom and adapted to be raised and an immovable lower portionsupported upon the base of the machine, a lost-motion connecting device between said top portion and said lifting plate, and a device for ejectingthe residue from the end of the ladle cylinder, said device comprising a forked rod having forked arms at one end pivotally connected to the machine base, a lostmotion connecting means positively engaging the other end of said arm and being connected to the upper portion of the ladle cylinder and adapted to raise said arm upon upward movement of said upper portion of said ladle cylinder beyond a predetermined distance, an ejector rod pivotally mounted on said arm between the ends of said arm but nearer to said forked end and extending through said lower portion of the ladle cylinder, said injector rod being adapted to enter said cylinder to eject the residue upon upward movement of said arm and to be retracted upon downward movement of said arm, said lost-motion connecting means effecting positive entry and retraction of said ejector rod in response to movements of said upper portion of the ladle cylinder which is moved in response to movements of said lifting plate.

References Cited in the file of this patent UNITED STATES PATENTS 1,318,379 Hazelett Oct. 14, 1919 1,394,246 Bolling Oct. 18, 1921 1,960,992 During et a1. May 29, 1934 1,961,941 Pack June 5, 1934 2,079,727 Wirtz May 11, 1937 2,112,343 Lester et al Mar. 29, 1938 2,124,529 Lester et a1. July 26, 1938 2,183,112 Vontobel Dec. 12, 1939 2,201,906 Lebkuchner May 21, 1940 2,206,211 Wagner a- July 2, 1940 

